Expression of β2-adrenoceptors in halobacteria View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1997-01

AUTHORS

P. Söhlemann, Jörg Soppa, Dieter Oesterhelt, Martin J. Lohse

ABSTRACT

Halobacteria are halophilic representatives of the recently defined domain, the Archaea. Halobacterium salinarium belongs to this group of microorganisms and contains large amounts of bacteriorhodopsin in its membrane. Bacteriorhodopsin is a seven-transmembrane protein that consists of bacterio-opsin (BO), and the chromophore retinal, which is covalently attached to BO. We have investigated whether the expression machinery for BO can be utilized for synthesis of the human beta 2-adrenoceptor (beta 2-AR), a protein with a similar seven-transmembrane-helix topology. An expression vector for BO synthesis was modified to express beta 2-ARs under the control of BO regulatory clements in H. salinarium. Homologous recombination into the genome was verified by polymerase chain reactions. Northern blots revealed transcripts of the calculated size and significant amounts of epitope-tagged beta 2-ARs were detected in Western blots. However, binding of the beta-AR antagonist 125I-cyanopindolol revealed low levels of functional receptors, and the ligand binding properties of these receptors were altered when compared to native receptors. Expression of chimeras containing larger amino terminal portions of BO did not result in higher receptor levels. Expression of beta 2-AR in Haloferax volcanii, another member of halobacteria, was achieved with a vector carrying the ferredoxin promoter. The levels of functional receptor as determined by 125I-cyanopindolol binding were 180 fmol/mg protein. The beta-AR ligands isoprenaline and propranolol showed affinities expected for functional beta 2-ARs. Thus, functional human beta 2-ARs were expressed in halobacteria, constituting a first approach for expression of a eukaryotic protein in the domain of Archaea. More... »

PAGES

150-160

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/pl00004926

DOI

http://dx.doi.org/10.1007/pl00004926

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1051573754

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/9050006


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